drm/i915: Finalize contexts in GEM_CONTEXT_CREATE on version 13+

All the proto-context stuff for context creation exists to allow older
userspace drivers to set VMs and engine sets via SET_CONTEXT_PARAM.
Drivers need to update to use CONTEXT_CREATE_EXT_* for this going
forward.  Force the issue by blocking the old mechanism on any future
hardware generations.
Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Carl Zhang <carl.zhang@intel.com>
Cc: Michal Mrozek <michal.mrozek@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210708154835.528166-31-jason@jlekstrand.net

drivers/gpu/drm/i915/gem/i915_gem_context.c

@@ -1996,9 +1996,28 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 			goto err_pc;
 	}
 
+	if (GRAPHICS_VER(i915) > 12) {
+		struct i915_gem_context *ctx;
+
+		/* Get ourselves a context ID */
+		ret = xa_alloc(&ext_data.fpriv->context_xa, &id, NULL,
+			       xa_limit_32b, GFP_KERNEL);
+		if (ret)
+			goto err_pc;
+
+		ctx = i915_gem_create_context(i915, ext_data.pc);
+		if (IS_ERR(ctx)) {
+			ret = PTR_ERR(ctx);
+			goto err_pc;
+		}
+
+		proto_context_close(ext_data.pc);
+		gem_context_register(ctx, ext_data.fpriv, id);
+	} else {
 		ret = proto_context_register(ext_data.fpriv, ext_data.pc, &id);
 		if (ret < 0)
 			goto err_pc;
+	}
 
 	args->ctx_id = id;
 	drm_dbg(&i915->drm, "HW context %d created\n", args->ctx_id);
@@ -2181,16 +2200,18 @@ int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
 	mutex_lock(&file_priv->proto_context_lock);
 	ctx = __context_lookup(file_priv, args->ctx_id);
 	if (!ctx) {
-		/* FIXME: We should consider disallowing SET_CONTEXT_PARAM
-		 * for most things on future platforms.  Clients should be
-		 * using CONTEXT_CREATE_EXT_PARAM instead.
-		 */
 		pc = xa_load(&file_priv->proto_context_xa, args->ctx_id);
-		if (pc)
+		if (pc) {
+			/* Contexts should be finalized inside
+			 * GEM_CONTEXT_CREATE starting with graphics
+			 * version 13.
+			 */
+			WARN_ON(GRAPHICS_VER(file_priv->dev_priv) > 12);
 			ret = set_proto_ctx_param(file_priv, pc, args);
-		else
+		} else {
 			ret = -ENOENT;
 		}
+	}
 	mutex_unlock(&file_priv->proto_context_lock);
 
 	if (ctx) {